APPENDIX. — SNAKES. 253 



Page 191. Oxyrhopus petolarius. Add: 



Var. H. Oxyrhopus sebse, Dum. <5* Bibr. p. 1036. Scales of 

 the vertebral series rather larger. • 



p. Adult. Guayaquil. From Mr. Fraser's Collection. 



Page 194. 



Genus Isoscelis is to be erased, Isoscelis maculata being 

 identical with Rhabdosoma maculatum (p. 241). 



Instead of Isoscelis add : 



9. Tetragonosoma. Two nasals, nostril between ; noloreal; 

 one anterior, two posterior oculars ; scales smooth, mode- 

 rately imbricate, in seventeen rows ; ventral plates keeled. 

 Pinang. 



Page 204. Instead of Isoscelis add : 

 9. Tetragonosoma, Giinther. 



Lycodon with moderate, quadrangular body ; tail moderate ; 

 head depressed, with flat crown and moderate, obtuse muzzle ; 

 pupil elliptical, erect ; two nasals, nostril between ; loreal replaced 

 by posterior frontal ; one anterior, two posterior oculars. Scales 

 smooth, moderately imbricate, in seventeen rows; those of the 

 back equal to the others. Ventral plates and subcaudals keeled. 

 Anal entire ; subcaudals two-rowed. Pinang. 



Lycodon, sp., Cantor, Catal. Mai. Rept. p. 70. 



1. Tetragonosoma effrene. 

 Lycodon effraenis, Cantor, I. c. pi. 40. f. 2 (head). 



Dusky blackish brown, with broad distant white (in spirits) 

 rings ; head above on each side with a whitish streak. 



Original specimen of Dr. Cantor's description in the Collection 

 of the East India Company. 



Page 207. Ophites subcinctus. 



b. Adult. East Indies. From the Collection of the Zoological 

 Society. — White bands very obsolete. 



